How do I create a new windows form on .NET core 3.1

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I am getting a message "Use Preview Settings of .Net Core SDK" when I try to create a new windows forms project under .Net Core 3.1

What I have tried:

I have gone to Tools -> Options ... as instructed, ticked the options, done the restart but the problem persists.

Posted 5-Dec-19 8:59am

Ger Hayden

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Richard Deeming 5-Dec-19 15:02pm

Have you installed the latest version of Visual Studio 2019? 16.4 was released on Tuesday, and I believe it's required if you're going to use .NET Core 3.1:

Announcing .NET Core 3.1 – .NET Blog[^]
"Visual Studio 2019 16.4 ... is a required update to use .NET Core 3.1 with Visual Studio."

‘Tis the Season for the Visual Studio 2019 v16.4 Release – Visual Studio Blog[^]

Ger Hayden 5-Dec-19 16:20pm

I was on 16.2 - and whats better I see they have brought C++/CLI into the fold. I thought that was never going to happen.

Richard Deeming 6-Dec-19 12:18pm

And now there's a new preview version of the .NET Core WinForms designer in 16.5 preview 1:
Updates to .NET Core Windows Forms designer in Visual Studio 16.5 Preview 1 – .NET Blog[^]

Just in case you feel like living on the even-more-bleeding-edge. :)

Ger Hayden 6-Dec-19 18:18pm

I will get there - but I would like to see how my C++/CLI some of it more than 10 years old gets on when I port it. If it doesn't behave, the 16.5 here I come...

RickZeeland 5-Dec-19 16:04pm

It seems very experimental to me, if you can't get it working you might try one of these alternatives: https://www.slant.co/topics/2065/~best-cross-platform-tools-for-c-developers

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